Which type of wattmeter can’t be used for D.C?
Which type of wattmeter can't be used for D.C?
Right Answer is:
Induction type instruments
- Induction-type instruments work on AC supply only. This is based on the principle of induction motor, therefore called induction type instrument.
- We can use these instruments as an ammeter, voltmeter, wattmeter, and energy meter.
- The scale of induction-type instruments is quite uniform and extends over an angle of 300°.
- Currents up to 100A can be handled by induction-type instruments so that their power consumption is fairly large and cost relatively high.
|Permanent Magnet Type ammeter||DC current|
|Induction type ammeter||AC current|
|Moving iron voltmeter||AC and DC voltage|
|Moving iron ammeter||AC and DC current|